signal.h

一个简单的操作系统minix的核心代码

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				include/signal.h	 	 
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00700	/* The <signal.h> header defines all the ANSI and POSIX signals.
00701	 * MINIX supports all the signals required by POSIX. They are defined below.
00702	 * Some additional signals are also supported.
00703	 */
00704	
00705	#ifndef _SIGNAL_H
00706	#define _SIGNAL_H
00707	
00708	#ifndef _ANSI_H
00709	#include <ansi.h>
00710	#endif
00711	
00712	/* Here are types that are closely associated with signal handling. */
00713	typedef int sig_atomic_t;
00714	
00715	#ifdef _POSIX_SOURCE
00716	#ifndef _SIGSET_T
00717	#define _SIGSET_T
00718	typedef unsigned long sigset_t;
00719	#endif
00720	#endif
00721	
00722	#define _NSIG             16    /* number of signals used */
00723	
00724	#define SIGHUP             1    /* hangup */
00725	#define SIGINT             2    /* interrupt (DEL) */
00726	#define SIGQUIT            3    /* quit (ASCII FS) */
00727	#define SIGILL             4    /* illegal instruction */
00728	#define SIGTRAP            5    /* trace trap (not reset when caught) */
00729	#define SIGABRT            6    /* IOT instruction */
00730	#define SIGIOT             6    /* SIGABRT for people who speak PDP-11 */
00731	#define SIGUNUSED          7    /* spare code */
00732	#define SIGFPE             8    /* floating point exception */
00733	#define SIGKILL            9    /* kill (cannot be caught or ignored) */
00734	#define SIGUSR1           10    /* user defined signal # 1 */
00735	#define SIGSEGV           11    /* segmentation violation */
00736	#define SIGUSR2           12    /* user defined signal # 2 */
00737	#define SIGPIPE           13    /* write on a pipe with no one to read it */
00738	#define SIGALRM           14    /* alarm clock */
00739	#define SIGTERM           15    /* software termination signal from kill */
00740	
00741	#define SIGEMT             7    /* obsolete */
00742	#define SIGBUS            10    /* obsolete */
00743	
00744	/* POSIX requires the following signals to be defined, even if they are
00745	 * not supported.  Here are the definitions, but they are not supported.
00746	 */
00747	#define SIGCHLD           17    /* child process terminated or stopped */
00748	#define SIGCONT           18    /* continue if stopped */
00749	#define SIGSTOP           19    /* stop signal */
00750	#define SIGTSTP           20    /* interactive stop signal */
00751	#define SIGTTIN           21    /* background process wants to read */
00752	#define SIGTTOU           22    /* background process wants to write */
00753	
00754	/* The sighandler_t type is not allowed unless _POSIX_SOURCE is defined. */
00755	#ifdef _POSIX_SOURCE
00756	#define __sighandler_t sighandler_t
00757	#else
00758	typedef void (*__sighandler_t) (int);
00759	#endif
00760	
00761	/* Macros used as function pointers. */
00762	#define SIG_ERR    ((__sighandler_t) -1)        /* error return */
00763	#define SIG_DFL    ((__sighandler_t)  0)        /* default signal handling */
00764	#define SIG_IGN    ((__sighandler_t)  1)        /* ignore signal */
00765	#define SIG_HOLD   ((__sighandler_t)  2)        /* block signal */
00766	#define SIG_CATCH  ((__sighandler_t)  3)        /* catch signal */
00767	
00768	#ifdef _POSIX_SOURCE
00769	struct sigaction {
00770	  __sighandler_t sa_handler;    /* SIG_DFL, SIG_IGN, or pointer to function */
00771	  sigset_t sa_mask;             /* signals to be blocked during handler */
00772	  int sa_flags;                 /* special flags */
00773	};
00774	
00775	/* Fields for sa_flags. */
00776	#define SA_ONSTACK   0x0001     /* deliver signal on alternate stack */
00777	#define SA_RESETHAND 0x0002     /* reset signal handler when signal caught */
00778	#define SA_NODEFER   0x0004     /* don't block signal while catching it */
00779	#define SA_RESTART   0x0008     /* automatic system call restart */
00780	#define SA_SIGINFO   0x0010     /* extended signal handling */
00781	#define SA_NOCLDWAIT 0x0020     /* don't create zombies */
00782	#define SA_NOCLDSTOP 0x0040     /* don't receive SIGCHLD when child stops */
00783	
00784	/* POSIX requires these values for use with sigprocmask(2). */
00785	#define SIG_BLOCK          0    /* for blocking signals */
00786	#define SIG_UNBLOCK        1    /* for unblocking signals */
00787	#define SIG_SETMASK        2    /* for setting the signal mask */
00788	#define SIG_INQUIRE        4    /* for internal use only */
00789	#endif  /* _POSIX_SOURCE */
00790	
00791	/* POSIX and ANSI function prototypes. */
00792	_PROTOTYPE( int raise, (int _sig)                                       );
00793	_PROTOTYPE( __sighandler_t signal, (int _sig, __sighandler_t _func)     );
00794	
00795	#ifdef _POSIX_SOURCE
00796	_PROTOTYPE( int kill, (pid_t _pid, int _sig)                            );
00797	_PROTOTYPE( int sigaction,
00798	    (int _sig, const struct sigaction *_act, struct sigaction *_oact)   );
00799	_PROTOTYPE( int sigaddset, (sigset_t *_set, int _sig)                   );
00800	_PROTOTYPE( int sigdelset, (sigset_t *_set, int _sig)                   );
00801	_PROTOTYPE( int sigemptyset, (sigset_t *_set)                           );
00802	_PROTOTYPE( int sigfillset, (sigset_t *_set)                            );
00803	_PROTOTYPE( int sigismember, (sigset_t *_set, int _sig)                 );
00804	_PROTOTYPE( int sigpending, (sigset_t *_set)                            );
00805	_PROTOTYPE( int sigprocmask,
00806	            (int _how, const sigset_t *_set, sigset_t *_oset)           );
00807	_PROTOTYPE( int sigsuspend, (const sigset_t *_sigmask)                  );
00808	#endif
00809	
00810	#endif /* _SIGNAL_H */